The Australian funnyman told Morgan, an outspoken defender of Donald Trump, to "f--k off" on "Real Time with Bill Maher" Friday night after the British television personality said there's no Muslim ban.

"This is what you do Piers, you say he hasn't done this, he hasn't dont that, he's not going to do all these things," Jefferies said.

"Give him a f--king chance, mate. Hitler didn't kill the Jews on the first day, he worked up to it," the 39-year-old continued.

Morgan then proceeded to call the comments ridiculous and hysterical.

Jefferies also said that Morgan was sucking up to Trump because he won "The Apprentice" and now has a famous friend.

Piers Morgan, left, was told to "f--k off" by Jim Jefferies on "Real Time with Bill Maher." (Real Time with Bill Maher via YouTube)

The crowd of the HBO show applauded the comedian's points.

"Harry Potter" author J.K. Rowling was also a fan of what Jefferies had to say, tweeting, "yes, watching Piers Morgan being told to f--k off on live TV is *exactly* as satisfying as I'd always imagined."

Her post didn't go unnoticed as Morgan himself responded saying that's why he didn't read any of her books.

"If only you'd read Harry Potter, you'd know the downside of sucking up to the biggest bully in school is getting burned alive," Rowling fired back.